Um, why must I download the .ISO file, mount it with the -0 loop on Linux, and burn the subsequent stuff to DVD in order to upgrade?

Does anyone know what a royal PITA it is to get an actual CD mounted in a PV XEN server on an HP Blade environment?

I assume since we're instructed to burn to a DVD, that there's some magical reason for not being able to just run the install once you mount -o loop?